<template>
  <div>
    <h1>分类参数</h1>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示框 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <span class="select">选择商品分类:</span>
        <!-- 选择商品分类的级联选择框 -->
        <el-cascader
          v-model="selectedCateKeys"
          :options="catelist"
          :props="cateProps"
          @change="handleChange"
        ></el-cascader>
      </el-row>

      <!-- tab页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 动态参数添加按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEdit(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态数据面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 静态数据添加按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
          >添加属性</el-button>
          <!-- 静态数据表格 -->
          <el-table :data="onlyData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEdit(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加'+ titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑参数对话框 -->
    <el-dialog
      :title="'添加'+ titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyData: [],
      // 静态属性的数据
      onlyData: [],
      // 控制参数添加框显示
      addDialogVisible: false,
      // 添加参数表单的数据内容
      addForm: {},
      // 添加表单的验证规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入名称', trigger: 'blur' }]
      },
      // 控制编辑框的显示
      editDialogVisible: false,
      // 编辑参数表单的数据内容
      editForm: {},
      // 编辑表单的验证规则
      editFormRules: {
        attr_name: [{ required: true, message: '请输入名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      let { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取数据失败')
      this.catelist = res.data
    },
    handleChange() {
      this.getParamsData()
    },
    handleTabClick() {
      this.getParamsData()
    },
    // 对话框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定按钮完成表单的添加
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        let { data: res } = await this.$http.post(
          `categories/${this.cataID}/attributes`,
          { attr_name: this.addForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 201) return this.$message.error('添加数据失败')
        this.$message.success('添加成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 展示编辑对话框
    async showEdit(attr_id) {
      let { data: res } = await this.$http.get(
        `categories/${this.cataID}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      )
      if (res.meta.status !== 200) return this.$message.error('获取表单失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 编辑对话框关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 完成编辑事件
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        let { data: res } = await this.$http.put(
          `categories/${this.cataID}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )
        if (res.meta.status !== 200) return this.$message.error('编辑失败')
        this.$message.success('编辑成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 删除操作
    async removeParams(attr_id) {
      let confirmRes = await this.$confirm(
        '请问是否要永久删除该信息',
        '删除提示',
        {
          confirmButtonText: '确认删除',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 如果用户点击确认，则confirmRes 为'confirm'
      // 如果用户点击取消, 则confirmRes获取的就是catch的错误消息'cancel'
      if (confirmRes !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      let { data: res } = await this.$http.delete(
        `categories/${this.cataID}/attributes/${attr_id}`
      )
      console.log(res)

      if (res.meta.status !== 200) return this.$message.error('删除失败')
      this.$message.success('删除成功')
      this.getParamsData()
    },
    // 文本框失去焦点
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    showInput(row) {
      row.inputVisible = true
      //$nextTick:在页面上元素被重新渲染之后，调用回调函数的代码
      this.$nextTick(_ => {
        //让文本框自动获得焦点
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除tag
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    // 保存数据
    async saveAttrVals(row) {
      let { data: res } = await this.$http.put(
        `categories/${this.cataID}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) return this.$message.error('修改失败')
      this.$message.success('修改成功')
    },
    async getParamsData() {
      // 选中的不是三级分类,则清空数组
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyData = []
        this.onlyData = []
        return
      }
      // 根据所选id获取对应的参数
      let { data: res } = await this.$http.get(
        `categories/${this.cataID}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) return this.$message.error('获取数据失败')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制按钮与文本框的显示
        item.inputVisible = false
        // 输入框内容
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyData = res.data
      } else {
        this.onlyData = res.data
      }
    }
  },
  computed: {
    // 若按钮被禁用则返回true
    isBtnDisabled() {
      return this.selectedCateKeys.length !== 3
    },
    // 当前选中的三级分类的id
    cataID() {
      if (this.selectedCateKeys.length !== 3) return null
      return this.selectedCateKeys[2]
    },
    // 动态计算标题文本
    titleText() {
      if (this.activeName == 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.select {
  margin-right: 15px;
}
.input-new-tag {
  width: 150px;
}
</style>